On Tue, 13 Dec 2011, KAMEZAWA Hiroyuki wrote: > Subject: [PATCH] tracepoint: add tracepoints for debugging oom_score_adj. > > oom_score_adj is used for guarding processes from OOM-Killer. One of problem > is that it's inherited at fork(). When a daemon set oom_score_adj and > make children, it's hard to know where the value is set. > > This patch adds some tracepoints useful for debugging. This patch adds > 3 trace points. > - creating new task > - renaming a task (exec) > - set oom_score_adj > > To debug, users need to enable some trace pointer. Maybe filtering is useful as > > # EVENT=/sys/kernel/debug/tracing/events/task/ > # echo "oom_score_adj != 0" > $EVENT/task_newtask/filter > # echo "oom_score_adj != 0" > $EVENT/task_rename/filter > # echo 1 > $EVENT/enable > # EVENT=/sys/kernel/debug/tracing/events/oom/ > # echo 1 > $EVENT/enable > > output will be like this. > # grep oom /sys/kernel/debug/tracing/trace > bash-7699 [007] d..3 5140.744510: oom_score_adj_update: pid=7699 comm=bash oom_score_adj=-1000 > bash-7699 [007] ...1 5151.818022: task_newtask: pid=7729 comm=bash clone_flags=1200011 oom_score_adj=-1000 > ls-7729 [003] ...2 5151.818504: task_rename: pid=7729 oldcomm=bash newcomm=ls oom_score_adj=-1000 > bash-7699 [002] ...1 5175.701468: task_newtask: pid=7730 comm=bash clone_flags=1200011 oom_score_adj=-1000 > grep-7730 [007] ...2 5175.701993: task_rename: pid=7730 oldcomm=bash newcomm=grep oom_score_adj=-1000 > > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> Thanks for being persistant with this! -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>